Power amplifying machine



Fb- 23, 1932 E. l.. scHELLENs 1,846,362

POWER AMPLIFYING MACHINE Filed Aug. 51, 1925 45 'I' l 3 v 5 QZMM #fram/5x5;

EUGENE LEVERING scHnLLnNs, or POINT CLAIRE, ounnne, CANADA, ASsIeNon 'ro SISI Patented Feb. 23, 1932 UNITED STATES PATENT- oFFlcE FRANKLIN RAILWAY SUPPLY COMPANY, A CORPORATION 0F DELAWARE y Pownn AMPLIFYING MACHINE original appliqaiion ined necemberis, 1924, serial No. 756.166.` Divided and this s1, 1925. serial No. 53,624. l l

The invention relates to a power amplifying machine, as described in the present specification and illustrated in the accompanying drawings that form part ofthe same.

The `invention consists essentially of the novel features of construction pointed out broadly `and specifically in the claims for novelty following a description containing an explanation in detail of anacceptable form of the invention.

The objects of the invention are toinsure even pressures and closed `ports following' each operation; to avoid slippages ofthe pressures; to inspire the engineer-incharge with confidence in the operation ofthe reverse gear and thereby save damage to life and property; toutilize for accuracy `ai screw operating means originallyA disclosed in Let@ ters Patent of the `United States Number 1,476,470 of December 4,1923 and filed No vember 5, 1919 in another form; and generally to provide an efficient, durable "and serviceable mechanism in a power amplify-` ing machine. f

In the drawings, Figure lis a longitudinal sectional view of the cylinder and piston,

ing broken away to show theconnection of the reach rod to the piston.v i y y Like numerals of reference indicatecorrelspending parts in thel various figures.

Referring to the drawings, the cylinder 40 contains a differential trunk piston 41 and the trunk of this piston isof lesser diameter than the head 42 rigidly secured to the trunk, consequently there is `anraunular chamber 43 between the trunk and the cylinder wall,

which is the constantpressure chamber, this chamber being continuously connected to the fluid supply through the inlet 44.

The valve mechanism is contained in the head 42 and for this purpose a central chain` the directionof `the trunk bridge from which the reach rod lug extends. l y

The variable pressure chamber 47 is-coni rior of the trunk pistonthrough whichthe Gil` pressure fluid escapes from the variable pressure chamber 47 to the atmosphere.` f

The valve which is `of the slide type' conf trols the passage of fluid through the ports 48 and 49 and slides longitudinally to uncover the same, said valve being held to its `seat by the pin 51, which `is resiliently held thereto by the-spring 52 through the squared end 53 of the lead screw 54, said squared end e ngaging the valve 50 by means of the boss 55 from the valveprojecting into a correspond-` ing recess into the squaredaend ofthe screw. etween the trunk of the piston 41 andthe head 42 the packing 57 isheld in arecess 58 by thering' 59, which' keeps saidpacking `to` its engagement with the cylinder wall.`

The sleeve 61 enclosesthe screw 54 and is screwed on to the nut 62, which operates on the lead screw 54 for moving the latter.

The nut 62 is flanged at 63 and turns in the cylinder head 64 `within the central circular opening 65 in the head on the flange 667 which extends outwardly and contains the ball bearings 67 and packinf` 68 that are held in by the spring 69 and cap d0.

The cylinderhead 6411s secured to the cyl;

inder in any suitable manner, both having finished faces meeting at 71. The `faucet 72 controls the drain opening 7 3 `and is adapted to `be `used in :clearing the vari able pressure4 chamber from the effects of condensation,

The valve chamber 45 is shown as closed by the screw cap 74 and ispreferably squared inwardly beyond the cap;th,reading though notnecessarily so. 0

The other end of the cylinder 40 is closed by the annular cap'75 forming a bearing for the trunk ofthe. piston and ,packed` at 76 against the flange 77,` said cap having the inlet 44 mentioned hereinbefore.

The sleeve 61 coupledfto theuniversal 1 applioationfled August soA joint 78 operated by a wheel 79 and this enables the engineer to turn said wheel and thereby rotate the nut and propel the lead screw and the valve engaged with its squared end.

lThe operation of the gear will be clear from the following: l

Assumingethat the pressures on each side ofthe piston headfare sobalanced as toretain the pistonstationary, and it is desired to move the piston to the leit,l the sleeve 61 and the nut 62 are rotated the hand' wheel 7 9) Yto -move Vthev lead screw* 54y and valve 50 to the left. This uncoversthe Vport 48 allowing fluid pressure topass from the chamber 43 tothe chamber 47 until the-pressure is increased inthe latterz chamber sur'- ii'cie'ntly to move the piston tothe left until the piston mevesfar enough to recio/se'the` port-48. -Whenit-is'desired to move the pls-` ton to Athe rightlthe 'leadiscrew and valve is..

moved to the right. This opens theport 49 to the valve chamber 45 afndiestablishes commrmieation between the-"chamber l47 and: the

interior 'of' the trunk 'to the atmospliere` Fluid willznow be' exhausted from the chamber L157-untill the pressure is.v reduced 'suiciently to Iallowthe pressure in' the annular chamber 48 "to move the piston to the -right. "This movement acts to reclosethe port 49.*and reestablishthe'balanced condition.

` If, during a`Y movement of the. piston, the.

piston'moves-far enough to close the port being usedfor the movernent and'cause the valve touncover the. other' port tothe valve chamber, the chamber 47 will have commu'- nication eitherf'witli theatmosphere or the chamber 43, dependingV on the direction of" movement; and the pressures will automatically be balanced. .7;

This application isa `division` of my copendingapplication-Serial No. 7 56,160, led

December-15,1924.

What I claim is comprising` al cylinder,V a piston', av control valve in the piston head', a lead 'screw engaging said valve, means for. holding Isaidlead screw as again'strotation, and .meansior movin g said leadscrew 'longitudinally comprising a manually. rotatable sleeve member and a l. In apparatus of the character described,

nut member secured thereto and engaging said lead screw.

4. Apparatus of the character described comprising a cylinder, a trunk piston movable thereindividing said cylinder'into an annular and-a cylindrical chamber, a valve chamber in the piston head communicating with said cylindrical chamber, a valve seat in saidvalve chamber having a port ,commu-v nicating with said annularchamber and a .port communicating with the atmosphere through the piston trunk, and a slide valve Lmovable on 4said seat to control said porting, 4

together` with a lead screw fixed as against rotation for actuating said valve.

v 5. .Apparatus of the character. described comprising a cylindenatrnnlrpiston mov-f abletherein dividing said cylinder into an an-l nular and-5a. cylindrical chamber, avalve.` chamber in the- -piston :head communicating with said cylindrical-chamber, a valve seat in said valve chamber; having a lport communicating with said annular)chamberand a port communicatingwith l the atmosphere through the piston trunk, andaslide valve movable on' said scatto 'control said-porting,

together with valve actuatingmeans compris.-

ing a lead screw having al squared portion engagingsaidfvalvm, v 6. Apparatus; O15-the.v character described with said cylindrical chamber, a'valve seat. insaid valve chamber-having a-port coinmimicaftingwith thefannular. chamber anda port communicating: with 'the atmoslxherej through the piston trunk, and aslidevalve movable onv said scatto control saidporting,

' comprising a cylinder, a.. trunk. piston v movable-therein vdividing saidcylinder. into an. annular and acylindrical chambergajvalve. chamber in theipistonf head. communicating y together with valve' actuatingmeans comprisu ing. a lead.screwhavingafsquared'portion engaging said valve, and"means for moving said lead screw longitudinally? including a manually rotatable" nut l, member engaging said lead screw. y t

7. Apparatus of the. characterA described comprising-a. cylinder, a piston, ya control valveinthe piston head, and a valve-actuating lead screw extending throughthe cylinder head,eand means-for. moving saidllead screw longitudinally,comprising a manually rotatable nut'member mounted forfrotary motion in said cylinder head ftogetherrwith means for preventing'rotation of said lead screw."

v8. A fluid pressure operatedpowerreverse gear comprising, in combination. a "cylinder, a piston, a slide valve inthe piston headhavingV porting forY controlling-the `'operating fluid, and a valve actuating lead-screw extending through the cylinderA head and engaging said slide valve to prevent rotationl of the screw together with means comprisingy a manually rotatable nut'member mountedin lill seid head for moving said lead screw longitudinali 9. A yuid pressure operated power reverse gear including, in combination, a cylinder, a piston, and a control valve structure in the piston head having porting for controlling the operating fluid, said structure including n valve mounted in the piston head for recip` rooating movement but being fixed as against rotation therein, together With valve actuating means including a member havin a threaded portion extending through a cy inder head, and a cooperating threaded and r0- tetable part for moving said member longitudinally, the said member being ixed as against rotation by engagement with said valve.

Signed et Montreal, Canada, this 28th day of July 1925.

EUGENE LEVERING SCHELLENS. 

